<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>渐变</title>
		<style>
		 #d1{
			 height: 400px;
			 width: 400px;
			 border-radius: 50%;
			 border:2px solid red;
			 /* background: linear-gradient(to right,red,green,blue,yellow); */
			 background:radial-gradient(red,green,blue,yellow); 
			 
			 box-shadow: 0px 0px 10px 15px red;
		 }
		</style>
	</head>
	<body>
		<div id="d1"></div>
	</body>
</html>
